Job as Rehab Counselor / Qualifying as a Substance Abuse Professional?

I’m a psychology major at school, going into my last leg of undergrad schooling. I’ve known for a long time that I want to work with drug abuse/rehabilitation (my brother is a recovered heroin addict), and I was curious:

What is required to get a job as a rehab counselor and is the pay alright? Are there any other jobs you can recommend for a psych student who wants to work in this field?

Also, what goes into qualifying as a substance abuse professional?

Thanks in advance to anyone who can help!

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